Not sure why the instructor chose to use artboards - have they been using artboards throughout the course? Just curious. They want you to generate a scene in each artboard for summer and winter with the backpack - yes? I can't see your layers panel but you should be able to select just the backpack layer and generate a background. The lesson is teaching gen fill and wants the backpack to fit into the scene. You can also isolate the backpack on it's layer - just delete the white background and then do a gen fill. A screenshot of your layers panel with the artboards open to reveal all layers would help. It's very confusing for beginners to mix artboards and layers. You should be able to generate background or just do a generate. In my opinion, with the new harmonize feature coming soon (currently in beta) you don't need to generate background, just create the scene with generate and then you will be able to harmonize the backpack in there. I'm sorry if I'm confusing you or overwhelming you with choices - I have created a coursera course myself and want to help.
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